code: def testSplitTypeShared(self):
      try:
          comm = self.INTERCOMM.Split_type(MPI.COMM_TYPE_SHARED)
      except NotImplementedError:
          self.skipTest("mpi-comm-split_type")
      if comm != MPI.COMM_NULL:
          comm.Free()
      comm = self.INTERCOMM.Split_type(MPI.UNDEFINED)
      self.assertEqual(comm, MPI.COMM_NULL)
  
imports: from mpi4py import MPI
  import mpiunittest
label_desc: Use image node_id 10 for calling the BaseTestIntercomm obj's underlying member method code with example usage: obj.testSplitTypeShared() without return types